Reversing gearing



May 8, 1928.

H. A. TUTTLE REVERSING GEARING 3 Sheets-Sheet 1 Filed Aug. 2. 1.927

Mays,192s. 4 1,668,991

H. A. TUTTLE nEvEnsmG arming Filed Aug. 2. 1927 5 Sheets-sheet 2 u (l j 011% f,

May 8,' 1928.

' H. A. TUTTLE navrmsme GEARING Filed Aug. 2.` 1927 s sheets-sheet 5 17706277022 I IAA/WQ 1W Patented May 8, 1928.

` OFFICE HENRY A. '.riifrriin. or Urroiv, MASSACHUSETTS.

y miviiRsiNG GEARING. e'

Application ai'e'd August 2, 1927. serial N0. 210,122.

This invention relates to reversingl gearing especially adapted for marine propul sion and of the type comprising aligned* driving and driven shafts and means including planetary pinion gears to connect the shafts for the reverse drive of the driven shaft.

make the planetary pinion gears as large as is practicable whereby to keep down the' speed of rotation thereof'and thus insure longer life and freedom from wear of the gearing. Ordinarily, large pinion gears'can be provided in the usual type of planetary gearing only by increasing the ovei'all diameter of the gearing which is highly undesirable since space is limited. i

It is an object of this invention to provide a planetary reversing gearingk so ar-k ranged that large yplanetary pinion gears c an 'be used without increasing the external diameter of the gearing.

vide a reversing A further ob provision of a gearing having large planetary pinion gears and also a relatively high speed in reverse.. v e

In accomplishing the aboveobJects, I proof sets of planetary pinion gears each set comprising two separate pinion gears of different diameters. One of the pinion gears is arranged to'drive the other gear through an interposed idler gear.

It is a further objectpof this invention to have the idler gear cominon'to all of the planetary' pinion gears.

`Itis av yet furtheriobject of the invention to arrange the idler gear co-axially witli't'liey driving and driven shafts and within the sets ofcircumferentially-spaced planetary pinion gears so that a symmetrical arrangement of gearing is provided wherein the driving. forces are balanced andy wherein a gearing of small external `diameter is ob-V t n with the idler gear 32. A casing or drum tained.v U 4 y A further object is g'enerallyftoLv improve the construction and operation vof reversing gearings. 4 n n Fig. 1 is a longitudinal sectional elevation through a reversing gearing eniliodying'-ftliis' gear carrier.

In a gearing of this typeit is desirable to 'ect of this invention is the gearing having a plurality apertures 44 and 46 inthe gear carrier. A

Fig'. 5 is a plan view of the gear carrier. As. here shown, the reversing gearing embodying this invention includes the driving shaft 10 which may be driven from an vengine, and the driven shaft 12 which may be the propeller shaftand is axially aligned withthe ydriving shaft.V The driving shaft y14 and against the flange 16 thereof.` Boltsv 24 anda dowel lpin 26 serve to connectisaidhub 22with the hub 14, whereby to secure the internal?gear18`in driving connection with the driving shafty 10. The driven shaft 12 has av reduced forward section28 the end of Vwhich is rotatably received in a bearing 30 in the wall 2O of the internal gear. An' idler pinion '32 constituting a `part of this invention is rotatably supported on said'rey duced section 28 between the wall 2O of the internal gear and the full diameter of the driven shaft. `A planetary pinion gear cary rier has a hub 34 which is fixed to the driven shaft 12 bythe key 36in back of the reduced forward portion 28 thereof and is provided with annnlarcylindrical section '38 which overlies the idler gear 32. ySets ofpinioncarrying pins 40 and 42v respectively arel fixed in saidcylindrical section parallel with' the axisof thedriving and drivenfshafts and are extended through pinion-receiving smallplanetary pinion gear 48 is received in each of saidap'ertures'46 and is j ournalled on each ofthe pins 42. Said pinion *gears are arranged in mesh with the internal drivingge'ar 18 and also in, mesh with'the idler gear 32. Largeplanetary pinion-gearsVVA 5() are received in the apertures 44'of the s gear (,:a'rrierand` are Vjournalledy on thepinsy 40 ofsaid carrier and arev arranged in mesh kion gears 50. Said casingis provided with a forward end plate or wall 56 whichis rotatably supported through a bushing 60 on the yhub 22 of the driving internal gear'18. Said casing is'also provided with a rear cover plate or wall62 which detachably secured tothe casing by bolts 58 andis Eil secured to a casing by bolts 64 and is *rotatably supported through a bushing y66 on the driven shaft l2. A brake band 68 which may be oi' more or less usual construction is arranged to encircle andengage said easing and hold it stationary to set the gearing for reverse drive.

Clutch mechanism is ,provided lto clutch the casing to the driven shaft 12 whereby to lock theplanetary gearing elements and thus set the gearing for direct drive, the line of drive being'througn the gears. rihe clutch mechanism includes a set of clutch plates 70 which are provided with external gear teeth in their peripheries which mesh with extensions ot the internal gear teeth 54 of the-casing 52. End plates T2 and 74e are similarly arranged and constitute backing and pressure members Afor the clutch plates. A second set of clutch plates V76 is interspaced with the clutch plate 70 and is pro vided with internal gear teeth in their inner peripheries which are in `mesh with external gear teeth 7 8 formed on the hub 34 of the gear carrier. Pressure is adapted to be ap plied to the ,clutchby thrust pins 80 slidable in the rear end vplate G2 in the casing and adapted to bear against the pressure plate fT/i. Said pins are moved aXiall-y to set the clutchby links 82 which have rocking seats inthe groove 84 of an annular ring 86 which Ais internally screw threaded in anL annular projection 88 of the plate 62. Said links are provided with cam faces 90 which. are adapted to bear upon cam pins 92 of the thrust ,pins 80 to set theV clutch. Said -linlrs 82 are connected through links `9- vith a clutchoperating sleeve 96 which is slidable y.axiallypon thedriven shaft l2 and also on a pin 98 carried by the casing, for conjoint rotation vwith the casina.

The constructionof the clutch-operating mechanism and of the ring 86 are described and claimed in my co-pending application l Serial No. 180,705, filed April 4e, 1927 and need not/be Jurther described herewith since they do not form an importanteature of this invention.

lfYhen the clutch is operated there is an axial thrust on the enclosing easing 52 tending to move it axially and loose wear plates lOO'and A102 are `interposed respectively between the gear carrier and thewali 20 of the internal ,gear andbetween said wall and the forward end plate 5'6 of the enclosing casing to receive the clutch thrust and provide undue wear 'thereat With the arrangement of the ^gearingas herein described, Vit will be apparent that,

when the casing 52 is held against rotation to-set the .gearing for reverse drive, the internalgear 38 rotates the small pinions V38 to drive the idler gear 32 and that the idler gear rotates the large pinion 58 rupon the internal gear teeth of thestationary casing,

thus to rotate the gear' Ycarrier and the driven shaft reversely. `With the arrangenient shown, it will be seen that the planetary pinion gears Li8 and 50 can be much larger than usual without an increase in the external diameter of the casing 52 and while main-taining a relatively high speed in reverse. The idler gear can also be relatively large Vin diameter. `With this arrangement, the speed ot rotation of the pinion gears is relatively slow compared with what has VVbeen the case heretofore so that 4the wear on the bearings of the pinion gears is materially reduced. Since the pinion gears are large the number ol' teeth in en gagement between the pinion gears and the eooperatinggears is increased thus to re duce the stresses on the gear teeth and deerease'the wear thereof.

Since the idler gear 32 is common to all of the sets oi pinion gears, a substantial reduction in the number ofvgearing elements is obtained and, Iwith the axial disposition ot the idler gear, the pressure on the gear around its circumference is practically balanced and there is little tendency for the bushing 32 thereof to wear.

'ih'e gearing is lubricated by oil flowing through the passage l0a in the driving shait l0 and through passages 20a in the hub oi.` the internal gear 20.

l. claim: Y

l. Gearing mechanism comprising the combination oi a driving element, a driven element, a pair ot' separate planetary Ipinion gears adapted to connect sai-d elements, igor the'driving of said driven element, an idler gear meshing with both of said pinion gears, a brake gear meshing with one of said pinion gears and adapted to be held stationary 1for reverse drive,4 and a driving gear driven by said driving element meshing with said other pinion gear.

In al gearing mechanism, the -conibina-- tion of a driving gear, a ydriven planetary gear carrier, a pair ofseparate .pinion gears' rotatably carried by said carrier, one of said gears ybeing in mesh with saidxdriving gear, an idler gear in mesh with both of said pinion gears, and a bra-ke gear in mesh Withfsaid other pinion gearand adapted to be held stationary to set thegearing for reverse drive.

In a reverse gearing, the combination oi a driving internal gear, a driven piniongear carrier, a pair of separate pinion gears rotatably mounted on said .gear carrier, one of said pinion gears arranged in mesh with ksaid driving internal gear, an idler pinion gear in mesh with both of said planetary `pinion gears, and an internal brake gear in mesh with said other planetary `.piniongear and adap'tedto be held stationary to set the gearing for reverse drive.

4. Ina gearing mechanism, the combination of aligned driving and driven shafts, aV l driving gear fixed to the driving shaft, .a planetary gear carrier fixed to the driven shaft, a pair of planetary pinion gears rotatably mountedy on said gear carrier, one of which planetary pinion gears is arranged in mesh with said driving gear, an idler gear in mesh with both of said planetary pinion gears and disposed co-axially with said driving and driven shafts, and a brake gear in mesh with said other planetary pinion gear to set the gearing for reverse drive.

5. In a gearing mechanism, the combination of aligned driving and driven shafts, a driving internal gear fixed to said driving shaft, a planetary gear carrier fixed to said driven shaft, a pair of separate'planetary pinion gears journalled on said gear carrier, an idler gear in mesh with `both of Said planetary pinion gears and co-axially disposed with said driving and driven shafts, and an internal gear `in mesh with said other planetary pinion gear and adapted to be held stationary to set the `gearing for reverse drive.

6. In a gearing mechanism, the combination of a driving element, a driven element, gearing connecting said elements including sets of' planetary pinion gears, each set comprising two independent pinion gears, an idler gear which is common to all the sets of planetary pinion gears and which is in mesh with the two pinion gears of each set, a gear driven by said driving element in mesh with one of said pinion gears, and a brake. gear in mesh with said other pinion gear.

7. In a gearing mechanism, the combination of a driving elem-ent, a, driven element, gearing connecting said elements including sets of planetary pinion gears, each set comprising two independent pinion gears, an idler gear which is common to all the sets of planetary pinion gears and which is in mesh with the two pinion gears of each set and which is disposed concentrically'with the common axis of revolution of said sets of planetary pinion gears, a gear driven by said driving element in mesh with one of said pinion gears, and a brake gear in mesh with said other pinion gear.

8. In a reversing gearing, the combination of a driving gear, a driven planetary gear carrier, sets of planetary pinion gears carri ed by saidvcarrier, each set comprising two independent pinion gears one of which is in mesh with said driving gear, a brake gear meshing with the other pinion gear of each set, and an idler gear disposed within said sets of pinion gears and in mesh with both pinion gears of each set.

9. In a reverse gearing, the combination of aligned driving and driven shafts, a driving internal gear fixed to said driving shaft,

a planetary gear carrier fixed to lsaid drivenv shaft, sets of planetary pinion gears journalled on saidcarrier, each set comprising two independent pinion gears, one of which is in mesh with said driving internal gear, an internal brake gear in mesh with the other pinion gear of each set, and an idler gear co-axially disposed with said driving and driven shafts and disposed within said sets of planetary pinion gears and in mesh with the pinion gears of each set.

10. In a gearing mechanism, the combination of aligned driving and driven shafts, a

driving internal gear fixed to said driving shaft, a planetary gear carrier fixed to said driven shaft, sets of planetary pinion gears journalled on said gear carrier, each set comprising two independent pinion gears, one of which is in mesh with said driving internal Y gear, a brake gear in mesh with the other pinion gear of each set and adapted to be held stationary to condition the gearing for reverse drive and an idler pinion gear journalledV on said driven shaft concentrically therewith and disposed within said sets of planetary pinion gears and common to all of said sets and arranged in mesh with both of the pinion gears of each set.

In testimony whereof, I have signed my name to this specification.

HENRY A. TUTTLE. 

